北京市某中学改扩建项目结构设计

Structural design on certain school reconstruction and expansion project in Beijing

本文简要介绍了北京市某中学改扩建项目结构设计,重点讨论了地下空间引起的的大跨度、挡土墙及抗浮设计。大跨度重载楼盖选取双向预应力混凝土梁,采用三段抛物线基本线型,应用荷载平衡法预估预应力效应,并复核了梁预应力损失、挠度及裂缝。三层通高挡土墙选用框架柱作为水平受力支座,并复核挡土墙及其扶壁柱的构件内力。局部抗浮采用锚杆方案,并计算锚杆截面及长度。希望能对类似工程设计起参考借鉴作用。

This paper briefly introduces the structural design on certain school reconstruction and expansion projects in Beijing, focusing on the large-span roof, retaining wall and anti-floating design caused by the underground space. The heavy-loaded large-span roof selected two-way prestressed concrete beams and adopted a three-section parabola as the basic line type. The load balance method is used to predict the prestress effect, and the beam prestress loss, deflection,cracks have been reviewed. The three-floor-height retaining wall selects frame columns as horizontal supports and calculates the internal forces of the retaining wall and its buttress columns. Partially anti-floating plan use anchor rod, and calculate the cross section and length of anchor rod. Hope it can serve as a reference for similar projects design.