建筑預制混凝土結構論文：約束漿錨鋼筋搭接連接試驗研究

1、預制混凝土結構論文：約束漿錨鋼筋搭接連接試驗研究【中文摘要】預制混凝土結構是一種實現(xiàn)住宅產業(yè)化的有效途徑,而預制混凝土構件間的連接是關鍵,約束漿錨鋼筋搭接連接是由哈爾濱工業(yè)大學課題組研發(fā)應用于預制混凝土結構工程的鋼筋連接方法。該關鍵技術的優(yōu)點在于連接安全可靠、操作簡便、成本低。本文以螺旋箍筋作為約束措施,進行了不同配箍率對鋼筋搭接長度影響的試驗研究,通過試驗研究和理論分析,在保證連接可靠性前提下,建立起了螺旋箍筋體積配箍率對鋼筋搭接長度的影響規(guī)律。約束漿錨鋼筋搭接連接是基于粘結錨固原理進行連接的方法,混凝土結構設計規(guī)范(gb50010)要求鋼筋搭接接頭面積百分率為100%時,搭接長度ll為1.

2、6倍的錨固長度la,經初步理論分析和前期研究結論,提高配箍率sv可以使搭接長度ll降低。因此本文設計了一系列試件加以驗證,試驗設計參數(shù)以理論分析公式為基礎設定:鋼筋直徑12mm、16mm以及20mm,搭接長度1.4la、1.2la、1.0la,螺旋箍筋體積配箍率以理論分析為基準進行增減。試驗方法參照鋼筋機械連接通用技術規(guī)程(jgj107),進行了123個約束漿錨搭接連接試件的單向拉伸和高應力反復拉壓試驗。試驗中,配箍率為0的試件,在鋼筋屈服荷載附近發(fā)生縱向劈裂破壞;配箍率為理論分析設定的試件,在鋼筋極限荷載附近試件破壞或者鋼筋拉斷。試驗表明,在配置螺旋箍筋約束的情況下,可有效地降低鋼筋的搭接長

3、度。本文以試驗數(shù)據為基礎,進行了深入的理論分析和有限元分析,給出了考慮安全系數(shù)的設計計算方法及構造要求,為完善預制混凝土結構設計規(guī)程和工程應用提供了重要依據?！居⑽恼縫recast concrete structure is a efficient path to realize housing industrialization, whereas precast concrete members joint is key. restraint grouting-anchoring overlap-joint of steel bar method is brought forward f

4、or the first time by harbin institute of technology, and researched and applied to the system built-concrete structure engineering field. the merit of this critical technology is safe joint, simple and convenient manipulation, low cost.this article used spiral hoop acting as restraint measure, resea

5、rched the influencing of different match stirrup ratio to the bond length. by theoretical and experimental research, under the joint credibility, this article established the influence law of match stirrup ratio to bond length.restraint grouting-anchoring overlap-joint of steel bar is the joint meth

6、od build on bond anchorage theory. code for design of concrete structures(gb50010)requires that when splicing of bars joint-area percentage is 100%,lap length ll is 1.6 times of anchorage length la. by theoretical analysis and advanced research conclusion,improving match stirrup ratiosv could reduce

7、 the lap length ll .so this article designed a series of test specimen to verify it. the experiment design parameter set by theoretical analysis formula: bar diameter is 12mm,16mm and 20mm, lap length is 1.4la,1.2la and 1.0la,and spiral hoop match stirrup ratio. experimentation referred to technical

8、 specification for mechanical splicing of steel reinforcing bars (jgj 107), proceed 123restraint grouting-anchoring overlap-joint of steel bar specimenssimply tensioned and heavily stressed repeat pull- press test. on trial, the specimens of 0% spiral hoop match stirrup ratio occurred portrait split

9、 destroyed phenomena at steel bar yield load round. specimens of spiral hoop match stirrup ratio set by theoretical analysis, occurred specimens destroyed or steel bar snapped off at steel bar critical load round. test indicate that on deploying spiral hoop restrain occasions,it could effectively re

10、duce lap length. this article used experimental data as root, proceed in-depth theoretical analysis and finite element analysis, ascertained design calculation formula considering safety coefficient, supplied import gist for perfecting design specifications of system built-concrete structure and eng

11、ineering practice.【關鍵詞】預制混凝土結構 住宅產業(yè)化 約束 搭接連接 體積配箍率【英文關鍵詞】precast concrete structure housing industrialization restraint overlap match stirrup ratio【目錄】約束漿錨鋼筋搭接連接試驗研究摘要4-5abstract5第1章 緒論8-231.1 課題背景及意義8-91.2 國內外研究現(xiàn)狀及分析9-211.2.1 國內外住宅產業(yè)化現(xiàn)狀9-171.2.2 國內外鋼筋搭接連接研究現(xiàn)狀17-211.3 規(guī)范中對于搭接長度的規(guī)定21-221.4 本文的主要研究內容2

12、21.5 本章小結22-23第2章 約束漿錨鋼筋搭接連接試驗23-582.1 約束漿錨鋼筋搭接試件設計及試驗方案23-312.1.1 鋼筋搭接試驗試件設計23-252.1.2 試驗方案25-302.1.3 試驗用材料力學性能30-312.2 試驗現(xiàn)象與分析31-382.3 試驗數(shù)據處理與分析38-562.3.1 約束漿錨鋼筋搭接連接試件強度38-472.3.2 約束漿錨鋼筋搭接連接試件螺旋箍筋應變47-562.4 本章小結56-58第3章 約束漿錨鋼筋搭接連接理論分析58-753.1 螺旋箍筋p_(sv)與縱筋l_ l 關系的理論基礎58-623.1.1 搭接作用理論基礎58-593.1.2 鋼筋與混凝土界面應力分析59-603.1.3 螺旋箍筋應力分析60-623.2 約束漿錨鋼筋搭接連接截面分析位置的確定62-693.2.1 無約束情況的鋼筋錨固63-643.2.2 螺旋箍筋約束情況的鋼筋錨固64-673.2.3 約束狀態(tài)下的鋼筋搭接連接67-693.3 螺旋箍筋 _(sv)與縱筋 l_l的理論及設計公式69-733.4 本章小結73-75第4章 約束漿錨鋼筋搭接連